肖瑤 王鑫 符敏 劉晶晶 李學濤 程嵐
中圖分類號 R943 文獻標志碼 A 文章編號 1001-0408(2018)05-0611-04
DOI 10.6039/j.issn.1001-0408.2018.05.09
摘 要 目的:制備麥胚凝集素(WGA)修飾的長春瑞濱(VRB)陽離子脂質體(WGA-VRB陽離子脂質體),優化處方并進行細胞毒性試驗。方法:以磷脂、膽固醇為輔料,以3β-[N-(N′ -N′ -二甲基氨基乙烷)-氨基甲酰基]膽固醇鹽酸鹽(DC-Chol)為陽離子材料,以二硬脂酰磷脂酰乙醇胺-聚乙二醇2000(DSPE-PEG2000)為長循環鏈,采用薄膜分散法及硫酸銨梯度法制備WGA-VRB陽離子脂質體。以包封率為指標,采用星點設計-響應面法優化處方中DC-Chol、膽固醇和VRB用量。測定所制VRB脂質體和WGA-VRB陽離子脂質體中VRB含量,比較二者和空白陽離子脂質體作用于人乳腺癌細胞MCF-7和人非小細胞肺癌細胞A549后對細胞存活率的影響。結果:5 mL WGA-VRB陽離子脂質體的最優處方為磷脂22 mg、膽固醇12 mg、DC-Chol 8 mg、VRB 0.5 mg,其包封率為(92.24±1.21)%(n=3),與預測值的相對誤差為5.3%。VRB脂質體和WGA-VRB陽離子脂質體中VRB含量分別為(96.01± 3.26)、(93.39±1.59) μg/mL(n=3);與空白陽離子脂質體和VRB脂質體比較,WGA-VRB陽離子脂質體可明顯降低MCF-7、A549細胞的存活率(P<0.05)。結論:成功制得WGA-VRB陽離子脂質體,其對MCF-7、A549細胞存活的抑制作用強于VRB脂質體。
關鍵詞 麥胚凝集素;長春瑞濱;陽離子脂質體;處方優選;星點設計-響應面法;含量測定
ABSTRACT OBJECTIVE: To prepare Wheat germ agglutinin (WGA) modified vinorelbine (VRB) cationic liposomes (WGA-VRB cationic liposomes), and to optimize the formulation and conduct cytotoxicity test. METHODS: Thin-film diffusion and ammonium sulfate gradient method were used to prepare WGA-VRB cationic liposomes using phospholipid and cholesterol as excipient, 3β-[N-(N′ -N′ -dimethyl aminoethane)-carbamoyl] cholesterol hydrochloride (DC-Chol) as cationic material, distearoyl phosphatidylethanolamine-polyethylene glycol 2000 (DSPE-PEG2000) as long cycle chain. Using encapsulation rate as index, central composite design-response surface methodology was used to optimize the amount of DC-Chol, cholesterol and VRB. The contents of VRB in VRB liposomes and WGA-VRB cationic liposomes were determined. The effects of them and blank cationic liposomes on survival rates of human breast cancer cell MCF-7 and human non-small cell lung cancer cells A549 were compared. RESULTS: The optimal formulation of 5 mL WGA-VRB cationic liposomes was as follows as phospholipid 22 mg, cholesterol 12 mg, DC-Chol 8 mg, VRB 0.5 mg. Encapsulation rate of the liposomes was (92.24±1.21)%(n=3), relative error of which to predicted value was 5.3%. The contents of VRB in VRB liposomes and WGA-VRB cationic liposomes were (96.01±3.26),(93.39±1.59) μg/mL(n=3). Compared with blank cationic liposomes and VRB liposomes, WGA-VRB cationic liposomes could significantly reduce survival rate of MCF-7 and A549. CONCLUSIONS: WGA-VRB cationic liposomes are prepared successfully. Inhibitory effect of WGA-VRB cationic liposomes on MCF-7 and A549 cell survival is stronger than that of VRB liposomes.
KEYWORDS Wheat germ agglutinin; Vinorelbine; Cationic liposomes; Formulation optimization; Central composite design- response surface methodology; Content determination
麥胚凝集素(WGA)是從小麥胚芽中提取的一種能與專一性糖結合、促進細胞凝集的二聚體蛋白質。研究表明將其與藥物或載體結合,可借助凝集素對癌細胞的親和作用增強抗癌活性[1]。脂質體是由磷脂雙分子層組成的類生物細胞膜結構,有降低藥物不良反應、提高藥物體內靶向性的優點[2]。但普通脂質體體內循環周期短、主動靶向性弱,限制了脂質體的進一步應用[3-4]。研究發現,與正常細胞相比,腫瘤細胞膜表面通常帶有較多的負電荷[5]。……